Unravelling and weaving, sometimes simultaneously

A 100WCGU is a challenge to write a 100 word story based on a prompt. This challenge is prompted by a photo of the Grand Canyon Skywalk in Arizona:

I slipped on the blue paper shoe covers, studiously avoiding downward glances as I stepped out on the glass bridge. No matter how many times I walked it, the same tugging sensation began in my gut, electric wires pulling taut in my limbs, zapping my head with the sensation of falling. An occupational hazard my nervous system protested. Go back, it said. Go back.

Today there was something different out there; somehow a coyote had gotten on the Skywalk and stood facing me, feet braced… grinning? My heart stuttered, stalled, and then accelerated. Suddenly, there was no glass at all.